GPT-5.5
OpenAI released GPT-5.5 (codename Spud), improving agentic coding and research ability.
82.7%Terminal-Bench 2.0 (reported by OpenAI)
Why it matters
It led agentic-coding tests such as Terminal-Bench 2.0; from May, its Instant version became ChatGPT's default for free users.
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Source: openai.com ↗